He probably had his eyes outside looking for any kind of visual clues, which is a natural behavior. Remember, he was no part of the crew and had no task to do.
Whatever he called out before, it was not his duty to do it, and looking at it after the desasterous result he shouldn´t have said anything anyway.
That is one of the problems in this case, the PIC got informations from Nav, from General, from ATC and TAWS. Now, when we look at it with lots of time, it looks as if 2 thirds of the information received was wrong or handled wrong and at the most critical time, approaching the minimum all information thinned out except TAWS, which probably was judged not usable anyway.
franzl